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When a ray of light (the incident ray)
strikes the shiny surface of a flat piece of glass, some of the light
energy in the ray is reflected.
 The angle
between the incident ray and a line perpendicular to the surface of
the glass at the point where the incident ray strikes the glass is
called the angle of incidence. The perpendicular line is called the
normal. It is not a light ray but a tool to allow the measurement of
angles. The angle between the reflected ray and the normal is called
the angle of reflection. The Law of Reflection states that the angle
of reflection of a light ray is equal to the angle of incidence. In
other words, the angle at which a light ray strikes a reflective
surface determines the angle that the ray will reflect off the
surface. 
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